Data from: Corrosion resistant systems of formate packer fluid for G3/N80/TP110SS pipes at high temperature, high pressure and high H2S/CO2 ratios

A series of corrosion problems caused by high-temperature, high-pressure and high-acid gas environments has been an issue in oil and gas production for a long time. During the development of a high-acid gas field, the petroleum pipe is subjected to many aspects of corrosion, and the corrosion mechanism is complicated by the condition of the coexistence of H2S/CO2/O2. Based on the study of the corrosion problem associated with the formate packer fluid in Southwest China, three kinds of steels were studied for corrosion prevention in the Alloy G3/N80 Steel/TP110SS Steel. The study shows that the corrosion rate of the formate packer fluid is low, but corrosion is severe in environments characterised by high temperatures, high pressures and high acid gas contents. Based on the consideration of cost and the difficulty of realization, an anti-corrosion system was constructed based on the existing packer fluid, mainly through the introduction of a variety of anti-corrosion additives. Through the selection of various additives and corrosion experiments, a corrosion protection system of formate packer fluid was developed. Corrosion tests show that the corrosion rate of the system must be less than 0.076 mm/a to achieve the purpose of corrosion protection. The formate packer fluid with corrosion protection can meet the needs of the current application.

长期以来，高温、高压、高酸性气体环境引发的一系列腐蚀问题，始终是油气开采领域的共性挑战。在高酸性气田开发过程中，石油管材会受到多维度腐蚀，且由于硫化氢（Hydrogen Sulfide, H₂S）、二氧化碳（Carbon Dioxide, CO₂）与氧气（Oxygen, O₂）共存的复杂工况，腐蚀机制进一步复杂化。基于我国西南地区甲酸盐封隔液（formate packer fluid）相关腐蚀问题的研究，针对G3合金（Alloy G3）、N80钢与TP110SS钢三种材料开展了防腐性能探究。研究表明，常规甲酸盐封隔液的腐蚀速率较低，但在高温、高压、高酸性气体含量的工况下，腐蚀情况仍较为严重。综合考量成本与实施难度后，研究团队以现有封隔液为基础，通过引入多种防腐添加剂构建了一套防腐体系。经过多种添加剂的筛选与腐蚀实验，最终研发出适配甲酸盐封隔液的专用防腐体系。腐蚀测试结果表明，该体系的腐蚀速率需低于0.076毫米/年，方可达成预期防腐目标。搭载该防腐体系的甲酸盐封隔液，可满足当前油气开采场景的实际应用需求。